Chemical Engineering Thermodynamics

301. One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one

  1. Hour
  2. Day
  3. Minute
  4. Second

Correct answer: (B)
Day

302. Out of the following refrigeration cycles, which one has maximum COP?

  1. Air cycle
  2. Carnot cycle
  3. Ordinary vapor compression cycle
  4. Vapor compression with a reversible expansion engine

Correct answer: (B)
Carnot cycle

303. Out of the following refrigeration cycles, which one has the minimum COP (Co-efficient of performance)?

  1. Air cycle
  2. Carnot cycle
  3. Ordinary vapour compression cycle
  4. Vapour compression with a reversible expansion engine

Correct answer: (A)
Air cycle

304. Partial molar free energy of an element A in solution is same as its

  1. Chemical potential
  2. Activity
  3. Fugacity
  4. Activity co-efficient

Correct answer: (A)
Chemical potential

305. Pick out the Clausius-Clapeyron equation from the following:

  1. dP/dT = ΔH/TΔV
  2. ln P = - (ΔH/RT) + constant
  3. ΔF = ΔH + T [∂(ΔF)/∂T]P
  4. None of these

Correct answer: (B)
ln P = - (ΔH/RT) + constant

306. Pick out the correct equation relating 'F' and 'A'.

  1. F = A + PV
  2. F = E + A
  3. F = A - TS
  4. F = A + TS

Correct answer: (A)
F = A + PV

307. Pick out the correct statement.

  1. Like internal energy and enthalpy, the absolute value of standard entropy for elementary substances is zero
  2. Melting of ice involves increase in enthalpy and a decrease in randomness
  3. The internal energy of an ideal gas depends only on its pressure
  4. Maximum work is done under reversible conditions

Correct answer: (D)
Maximum work is done under reversible conditions

308. Pick out the correct statement:

  1. In an isothermal system, irreversible work is more than reversible work
  2. Under reversible conditions, the adiabatic work is less than isothermal work
  3. Heat, work, enthalpy and entropy are all 'state functions'
  4. Matter and energy cannot be exchanged with the surroundings in a closed system

Correct answer: (B)
Under reversible conditions, the adiabatic work is less than isothermal work

309. Pick out the extensive property out of the following.

  1. Surface tension
  2. Free energy
  3. Specific heat
  4. Refractive index

Correct answer: (B)
Free energy

310. Pick out the undesirable property for a good refrigerant.

  1. High thermal conductivity
  2. Low freezing point
  3. Large latent heat of vaporisation
  4. High viscosity

Correct answer: (D)
High viscosity

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